Modifications

Run the sketch to see the calculated altitude.  

Run the sketch to see the calculated altitude.  

{{ADFImage|BMP085-Utiliser-APIv2-03.png|640px}}

{{ADFImage|BMP085-Utiliser-APIv2-03.png}}

The data above is reasonably close to what I'd expect at my location, but we can improve the accuracy by changing the reference sea level pressure, which will change depending on the weather conditions. '''Every 1 hPa that we are off on the sea level pressure equals about 8.5 m of error in the altitude calculations!'''

The data above is reasonably close to what I'd expect at my location, but we can improve the accuracy by changing the reference sea level pressure, which will change depending on the weather conditions. '''Every 1 hPa that we are off on the sea level pressure equals about 8.5 m of error in the altitude calculations!'''

This now gives us the following results, which shows that calibrating for your local conditions is often worthwhile when working with low altitudes!  

This now gives us the following results, which shows that calibrating for your local conditions is often worthwhile when working with low altitudes!  

{{ADFImage|BMP085-Utiliser-APIv2-05.png|640px}}

{{ADFImage|BMP085-Utiliser-APIv2-05.png}}

Just be careful looking for local mean pressure at sea level values, since the functions in the driver are expecting hPa units, not one of the dozens of other values you may encounter, but you should be able to [http://www.engineeringtoolbox.com/pressure-units-converter-d_569.html convert anything you find to hPa] which is a standard SI unit.  

Just be careful looking for local mean pressure at sea level values, since the functions in the driver are expecting hPa units, not one of the dozens of other values you may encounter, but you should be able to [http://www.engineeringtoolbox.com/pressure-units-converter-d_569.html convert anything you find to hPa] which is a standard SI unit.  

{{BMP085-TRAILER}}

{{BMP085-TRAILER}}